return Command(cmdValidatePromo, next);
tee() splits a stream into two branches. It seems straightforward, but the implementation requires buffering: if one branch is read faster than the other, the data must be held somewhere until the slower branch catches up.。关于这个话题，爱思助手下载最新版本提供了深入分析
由于不能导出，缩略图是我截图拼接而成Gemini Canvas打开 Gemini 网页，选择 Canvas 模式，即可让 Gemini 根据内容生成幻灯片，任务完成后可以导出到谷歌幻灯片，就能下载为 PPTX 格式。。safew官方版本下载对此有专业解读
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